Bar-graph indicator for ac signals

  
Indicator was designed for displaying the peak level of small ac signals from a variety of transducers including microphones, strain gauges and photodiodes. The circuit responds to input signals contained within the audio frequency spectrum, i.e., 30 Hz to 20 kHz, although a reduced response extends up to 40 kHz. Maximum sensitivity for the component values shown, with VR1 fully clockwise, is 30 mV peak-to-peak.
Bar-graph indicator for ac signals  - schematic

The indicator can be calibrated by setting VR1 when an appropriate input signal is applied.




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